You won't be able to copy/paste a Windows installation. For that you'll need disk cloning software. Free version should be available on your HDD manufacturer's website.
Before cloning, create a new partition on the HDD to receive the data and to preserve your existing personal files on the HDD. If there is no free space on your HDD to create the partition, simply go into Disk Mgmt. and right click on the existing partition and select "Shrink Partition" in order to free up space. This should create some "Unallocated Space" on the HDD. Right click on this space and select "Create New Simple Volume" and that will partition and format the new space. Don't worry about the drive letter. The cloning software should assign "C:" to your...